The application was developed for decalage measurements purpose, But it can be used for other cases as well.

This application is using sensor filters, In order to avoid both, gyro drift and noisy orientation, Therefore it shows a very accurate angle.

The idea is very simple, Almost every smartphone have sensors to measure its angle, So using 2 phones connected by Bluetooth we can measure the angle between them

You place 1st phone on the wing, And the 2nd you place carefully on the stabilizer, And see the decalage angle

Usage is very simple:
One phone needs to be discoverable by tapping on the menu 'Make discoverable'.
The second needs to connect to the first one by tapping on the menu 'Connect a device' and select the first device from a list.

For any questions feel free to contact me